Some 2021 F-150 vehicles built on or before 06-Dec-2021 equipped with a Pro Power Onboard inverter system may experience Ground Fault Detected message displayed after performing the test function and/or Breaker Tripped message displayed that indicates the incorrect breaker location. This may be due to the software in the accessory protocol interface module (APIM). To correct the condition, follow the Service Procedure steps to reprogram the APIM.
